Comminuting-mill



R. c. NEwHoUsE.

COMMINUTING MILL.

APPLICATION FILED JUNE 28, 1920.

Patented Dec. 7, 1920.

RAY C. NEWHOUSE, 0F WAUWATOSA, WISCONSIN, ASSIGNOR TO ALLIS'-CI-IAIlllllilBSA MANUFACTURING COMPANY,` yO IE MILWAUKEE, WISCONSIN, A CORPORATION OF DELAWARE.

COMMINUTING-MILL.

Original application filed August 23, 1917, Serial No. 1920. Serial T o 'all whom 'it may concern:

Be it known that I RAY C. NEwHoUsE, a citizen of the United States, residing at Wauwatosa, in the ycounty of Milwaukee and State of lllisconsin, have invented-a certain new and useful Comminuting-Mill, ofy which the following is a specification.

This invention relates to improvements in v the contraction of mills forl comminuting cement-making materials, coal, rock, ore and the like, and has particular relation to improvements in that type of comminuting mills known as combination mills.

An object of the invention is to provide a comminuting mill of the combination type, which issimple and compact in construction and efficient in operation. Another object of the invention is to improve the construction vand operation of mills ofthe type disclosed and claimed in application Serial No. 123,783, filed October 2, 1916.

One of the more specific objects'of the invention is to provide a combination mill in which there is ample screening capacity Ibetween the successive comminuting chambers.

Another specific object is to provide a single means between two successive cham,- bers of a combination mill, which will effeetively serve both as a holdback for the grinding bodies and as a line screening device for the discharge from the first cham ber.

A furthei specific object is to provide means whereby the sizing screen and the division partition may be simultaneously adjusted longitudinally of the mill.

Still another specific object is to provide a d-urable, readily manufactured and readily renewable device for screening the material discharged from one of the grinding chambers and delivered into a subsequent grinding cl1amber,.

The present application is a division of application Serial l\o. 188,258, filed August 23, 1917.

A clear conception of an embodiment of the invention may be had by referring to l the drawing accompanying and formin a part of this specification in which like re erence characters designate the same or similar parts in the various views.

Figure' l is a central vertical section Specification of Letters Patent.

Patented Dec. 7, 1920.

188,258. Divided and this application flied June 28', No. 393,164.

through a combination mill having ytherein a' division partition which is adjustable i along the length of the mill in order to vary the' volumetric capacities of the several grinding chambers.

Fig. 2 is an enlarged fragmentary transverse vertical section through a combination mill adapted to comminute material in a dry state.

'Fig 3 1s an enlarged fragmentary transverse vertical 'section through-the mill, thev section being taken along. the line III-III of F 1g. 2 looking in the directionjof the arrows.

The`combination mill illustrated in the i drawing com rises a rotary shell 1 having feed and d1sc arge heads 2,' 3, respectively,

and provided with an adjustable partition dividing the shell into coarse and fine grind ing chambers 5, (i, respectively. The mill is rotatably mounted in trunnion bearings 7, 8 and is adapted to be rotated by means of power applied to a driving gear 9.

The coarse grinding chamber 5 is ordinarily filled substantially to the center line of the shell 1, with relatively large comminuting bodies or balls 10, while the line l grindin or finishing chamber 6 is likewise The combined holdback and 'screening de! vice comprises a screen consisting of an annular serles of spaced bars 14 extendmg longitudinally of the shell 1 and detachably secured to a cast element 28 by means of any end retaining ring 17 anda front partition plate 18, the bars 14 are preferably ixedly spaced by means of distance pieces 30, 31 secured to the bar ends by welding or riveting.

The shell 1 is provided with an annular protecting lining or plate 27, located adjacent to the screening devices. The element 28 is provided with a series of conveying ribs 15 which are inclined relatively to the division partition, and which are located between the outer periphery of the screen and the inner periphery of the shell 1. The ribs 15 are preferably disposed at an angle less than 50 degrees relatively to a plane perpendicular to the longitudinal axis of the shell 1, and are connected by a ring 16 which forms a continuous support for the medial portions of the screen bars 14. The screen bars 14 are so spaced by the pieces 30, 31, that any material passing therebetween is sufficiently ne to be further reduced by the relatively .small grinding bodies in the finishing chamber. The bars 14 are preferably formed of wearresisting material suchas tool steel and may be formed by merely sawing or otherwise cutting bars of commercial tool steel into the proper lengths, and securing the distance piecesrBO, 3'1 thereto. l

The division partition comprises a pair of spaced annular plates 18, 20 between which is located a series of radial elevating vanes 4, the outer ends of which communicate with Y the'spacesfbetween the successive ribs 15 and the inner ends ofwhicli are directed toward a discharge cone or element 19. The plates 18, 20, the element 19, and the vanes 4 are firmly detachably united by means of clamping bolts 26.

The coarse grinding chamber 5 is provided with relatively thick sectional'liners 22, the liners directly adjacent to the discharge screen vbeing of less length than the others, as indicated in Fig. 1. The portion of the fine grinding chamber 6 directly adj acent to the division partition is provided with relatively thick sectional liners 23 substantially like the short liners 22 of' the chamber 5. The remaining portion of the chamber Gis provided with relatively thin sectional liners 24, which `are joined with the liners 23, by means of liners having graded thickness. The liners 22, 23, 24 may be of equal thickness or they may be of different thickness as disclosed.

During the normal operation of' the mill, rotary motion is imparted to the shell 1 and the relatively coarse material is fed into the mill through the feed trunnion 70, being partially reduced in the coarse grinding chamber 5 by means of the balls 10. The partially reduced` material passing the screen bars 14 is delivered by the ribs l5 upon the outer ends of the revolving vanes 4, which elevate and deliver suchy material through the central opening in the partition 20 into the fine grinding chamber G.

The material after being -reduced to the proper fineness in the chamber 6, passes through the screen 29 into the path of the said screen and said shell.

revolving vanes 12 which elevate and deliver the final product from the mill through the trunnion 80.

If it is desired to vary the relative capacities of the chambers 5, G, this may be done by adjusting the division partition longitudinally of the shell 1. Adjustment of the division partition may be effected by removing liners 22, 23 on one side of the partition, moving the` partition andthe screen as a unit a sufficient distance to fill up the gap produced by removal of the liners, and inserting the removed liners in the mill on the .opposite side of the adjusted elements. Y

It will be noted that hy forming the screen annular and of proper length, ample screening area may be provided for the first chamber 5.- By uniting the screen and the division partition, the division head may be adjusted along the mill without changing the relative location of the screen and the partition. By forming the screen as an annular series of spaced bars 14, maximum screening capacity is obtained for minimum length of bars. By disposing the ribs 15 at an angle less than 50 degrees relatively to a plane Vperpendicular to the a-xis of the shell 1, the materia-l will readily flowalong the helical ribs 15 during rotation of the mill and will gravitate into the path of the lifting vane'4. By utilizing'the screen as a holdback as well as for screening purposes, the necessity of providing separate devices to perform these functions, is eliminated. 100 The screen bars 14 may be readily removed and replaced when worn by merely removing the clamping bolts 26 and endwise sep. arating the coacting elements.

It should be understood that itis not de- 105 sired to limit the invention to the exact details of construction herein shown and described, for obvious modifications within the scope of the appended claims may occur to a person skilled in the art.

It is claimed and desired. to secure by Letters Patent: l

1. In combination, a rotary shell of uniform diameter throughout its length, and a head dividing said shell'into a plurality 115 of chambers, said head comprising a wall,

a continuous annular screen extending longitudinally of said shell and transversely of said wall, and a conveyer rib between 2. In combination, a rotary shell, and a head dividing said shell into a plurality of chambers, said head comprising a wall, a screen extending longitudinally of' said shell and transversely of said wall, a conveyer rib between Said screen and said shell, and means associated with said rib and directly engaging a medial portion of said screen to form a support therefor.`

3. In combination, a rotary shell, landv a head dividing said shell into a plurality of chambers, said head comprising a Wal1,"a screen extending longitudinally of said shell and transversely of said wall, and a conveyer rib between said screen and saidshell. said rib being disposed at an angle less than 50 degrees ielatively to a plane perpendicu- V lai` to the axis of said shell.

4. In combination, a rotary shell, and a head dividing said'shell into apluralityv of chambers, said head comprising a pair of spaced walls, lifting vanes in the space be'- tween said walls, an annular series of screen bars extending longitudinally of said shell and terminating at one of said walls, a helical conveyer ribl between said bars and said shell, and means associated with said rib'and directly engaging successive bars of said series to form a support for medial portions of said bars.

5.l 'In combination, a rotary shell forming a comminuting chamber, a wall atone end of said chamber, a continuous annular screen extending longitudinally of said shell and terminating at said wall, and a conveyer rib between said'screen and said shell terminating at said Wall, said rib being disposed at an angle less than 50 degrees relatively to a plane perpendicular to the axis of saidvshell.

In testimony whereof the signature of the inventor is afiixed hereto.

RAY C. NEWHOUSE. 

